Does a first trimester dating scan using crown rump length measurement reduce the rate of induction of labour for prolonged pregnancy? An uncompleted randomised controlled trial of 463 women.
BJOG
; 113(2): 171-6, 2006 Feb.
Article
em En
| MEDLINE
| ID: mdl-16411994
ABSTRACT
OBJECTIVE:
To evaluate the effect of a first trimester ultrasound dating scan on the rate of induction of labour for prolonged pregnancy.DESIGN:
Randomised controlled trial to include 400 women in each arm of the trial.SETTING:
Participating general practices and a district general teaching hospital. POPULATION Women attending their general practitioner in the first trimester to confirm pregnancy, in whom a first trimester ultrasound scan was not indicated.METHODS:
Women randomised to the study group (scan group) underwent an ultrasound dating scan between 8 and 12 weeks, measuring crown-rump length. The estimated date of delivery (EDD) was changed if there was a discrepancy of more than 5 days from the gestation, calculated from the last menstrual period (LMP). For the remaining women (no-scan group), gestation was determined using the LMP. MAIN OUTCOMEMEASURES:
The rate of induction of labour for prolonged pregnancy.RESULTS:
Due to circumstances beyond the researchers' control, recruitment was abandoned when 463 women had been enrolled. The EDD was adjusted in 13 (5.7%) women in the scan group and in 2 (0.9%) in the no-scan group. There was no difference in the rate of induction for prolonged pregnancy between the scan (19 [8.2%]) and the no-scan (17 [7.4%]) groups (relative risk 1.10; 95% CI 0.59-2.07).CONCLUSIONS:
Acknowledging the reduced numbers recruited for study, it is concluded that there is no evidence that a first trimester ultrasound dating scan reduces the rate of induction of labour for prolonged pregnancy and may result in a more expensive healthcare strategy.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Gravidez Prolongada
/
Estatura Cabeça-Cóccix
/
Trabalho de Parto Induzido
Tipo de estudo:
Clinical_trials
/
Diagnostic_studies
/
Etiology_studies
Limite:
Adult
/
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
BJOG
Ano de publicação:
2006
Tipo de documento:
Article